Newborn With a Sublingual Mass

A 1-week-old, full-term male newborn who was born after a normal pregnancy presented with labored breathing, xerostomia, poor bowel movements, symmetrical submucosal swelling of the oral floor, and a midline external punctum in the submental area; imaging showed a midline, sublingual, thin-walled, multiloculated lesion that extended inferiorly. What is your diagnosis?

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